A. \(r = \frac{{2\sqrt 3 }}{3}.\)
B. \(r = \frac{{2\sqrt 7 }}{3}.\)
C. \(r = \frac{{2\sqrt {15} }}{3}.\)
D. \(r = \frac{{2\sqrt {42} }}{3}.\)
A. 2
B. 1
C. 4
D. 0
A. \(F\left( x \right) = {e^{{x^2} + 2x - 3}} + C,C \in R.\)
B. \(F\left( x \right) = 2{e^{{x^2} + 2x - 3}} + C,C \in R.\)
C. \(F\left( x \right) = \frac{{{e^{{x^2} + 2x - 3}} + C}}{2},C \in R.\)
D. \(F\left( x \right) = \frac{{{e^{{x^2} + 2x - 3}}}}{{x + 1}} + C,C \in R.\)
A. \(pq = \frac{1}{2}.\)
B. \(pq=1\)
C. \(pq = \sqrt 3 .\)
D. \(pq=2\)
A. 341
B. 224
C. 42
D. 108
A. \(S = \left( {1; + \infty } \right).\)
B. \(S = \left( { - \infty ;1} \right).\)
C. \(S = ( - \infty ;1].\)
D. \(S = {\rm{[}}1; + \infty ).\)
A. \(( - \infty ;1]\)
B. \(\left( {1; + \infty } \right)\)
C. \(R\backslash \left\{ 1 \right\}\)
D. R
A. \(166 < n < 170.\)
B. \(131 < n < 158.\)
C. \(n>207\)
D. \(n<126\)
A. \(y = 2{x^2} + x + 2\)
B. \(y = 2{x^2} - 19x + 44\)
C. \(y = 2{x^2} - 7x\)
D. \(y = 2{x^2} + 13x + 18\)
A. 18
B. 17
C. 20
D. 19
A. \(R = \frac{{a\sqrt 2 }}{2}\)
B. \(R = \frac{a}{2}\)
C. \(R = \frac{{a\sqrt 5 }}{2}\)
D. \(R=2a\)
A. 215 triệu đồng.
B. 263 triệu đồng.
C. 218 triệu đồng.
D. 183 triệu đồng.
A. \(\frac{{{a^3}}}{{12}}.\)
B. \(\frac{{{a^3}}}{{36}}.\)
C. \(\frac{{{a^3}}}{6}.\)
D. \(\frac{{{a^3}}}{6}.\)
A. I = - 4
B. I = - 6
C. I = 6
D. I = 4
A. 2021
B. 2027
C. 2030
D. 2010
A. \(\frac{9}{{\sqrt {15} }}.\)
B. \(\frac{{15}}{{\sqrt {23} }}.\)
C. \(\frac{1}{{\sqrt {314} }}.\)
D. \(\frac{1}{{\sqrt {915} }}.\)
A. I(2;4)
B. I(4;2)
C. I(2; - 4)
D. I(- 4;2)
A. \(S=4\pi\)
B. \(S = \frac{{7\pi }}{6}.\)
C. \(S = \frac{{11\pi }}{6}.\)
D. \(S=5\pi\)
A. m = - 2
B. m = 2
C. m = 6
D. m = - 6
A. \(\overline z = 3 + 5i.\)
B. \(\overline z = - 5 + 3i.\)
C. \(\overline z = 5 + 3i.\)
D. \(\overline z = 3 - 5i.\)
A. h = 3R
B. h = 2R
C. R = 2h
D. R = 3h
A. \(\frac{{16}}{{55}}\)
B. \(\frac{{12}}{{45}}\)
C. \(\frac{{24}}{{65}}\)
D. \(\frac{8}{{165}}\)
A. 0,2342
B. 0,292.
C. 0,2927
D. 0,234
A. L = 0
B. \(L = - \infty \)
C. \(L = - \frac{3}{2}.\)
D. \(L = \frac{1}{2}.\)
A. \(y = \sqrt {4 - {x^2}} \)
B. \(y = {x^4} - 2{x^2} - 1\)
C. \(y = {e^{ - x}}\)
D. \(y = \frac{{x + 1}}{{2x - 3}}\)
A. Tứ diện ABC’D.
B. Tứ diện A’BCD.
C. Tứ diện AB’CD.
D. Tứ diện ABCD’
A. \(\cos \alpha = \frac{{\sqrt 2 }}{2}.\)
B. \(\cos \alpha = \frac{1}{{\sqrt 3 }}.\)
C. \(\cos \alpha = \frac{{\sqrt 3 }}{2}.\)
D. \(\cos \alpha = \sqrt {\frac{2}{5}} .\)
A. \(\left( \beta \right):x + 2y + 2z + 13 = 0.\)
B. \(\left( \beta \right):x + 2y + 2z - 15 = 0.\)
C. \(\left( \beta \right):x + 2y + 2z - 13 = 0.\)
D. \(\left( \beta \right):x + 2y + 2z + 15 = 0.\)
A. \(\frac{1}{3}.\)
B. \(\frac{1}{6}.\)
C. \(\frac{1}{4}.\)
D. \(\frac{1}{2}.\)
A. \(R = \sqrt {3} .\)
B. \(R = \sqrt {30} .\)
C. \(R = \sqrt {15} .\)
D. \(R = \sqrt {42} .\)
A. (- 3;0)
B. (0;3)
C. \(\left( { - \infty ; - 3} \right)\)
D. \(\left( {3; + \infty } \right)\)
A. \(V = \frac{{25\pi \sqrt {34} }}{3}\left( {c{m^3}} \right)\)
B. \(V = \frac{{25\pi \sqrt {39} }}{3}\left( {c{m^3}} \right)\)
C. \(V = \frac{{25\pi \sqrt {11} }}{3}\left( {c{m^3}} \right)\)
D. \(V = \frac{{25\pi \sqrt {61} }}{3}\left( {c{m^3}} \right)\)
A. \( - 15 < S < - 10.\)
B. \( - 20 < S < - 15.\)
C. \( - 5 < S < 0.\)
D. \( - 10 < S < - 5.\)
A. \(\ln \frac{a}{{\sqrt[3]{b}}} = \ln a - 3\ln b.\)
B. \(\ln \left( {{a^2}{b^4}} \right) = 2\ln \left( {ab} \right) + 2\ln b.\)
C. \(a\ln \frac{1}{b} = \ln {b^{ - a}}.\)
D. \({e^{\ln a - \ln b}} = \frac{a}{b}.\)
A. 180
B. 3360.
C. 960.
D. 5120.
A. \(\left( {3; + \infty } \right)\)
B. \(\left( { - \infty - 3} \right)\)
C. (0;3)
D. (- 3;0)
A. \(\frac{{{a^3}}}{4}.\)
B. \(\frac{{{3a^3}}}{4}.\)
C. \(\frac{{{a^3}}}{2}.\)
D. \(a^3\)
A. \(\frac{{{S_1}}}{{{S_2}}} = \frac{{135}}{{208}}.\)
B. \(\frac{{{S_1}}}{{{S_2}}} = \frac{{135}}{{343}}.\)
C. \(\frac{{{S_1}}}{{{S_2}}} = \frac{{208}}{{343}}.\)
D. \(\frac{{{S_1}}}{{{S_2}}} = \frac{{54}}{{343}}.\)
A. \(V = {a^3}\sqrt 2 .\)
B. \(V = \frac{{{a^3}\sqrt 2 }}{4}.\)
C. \(V = \frac{{{a^3}\sqrt 2 }}{2}.\)
D. \(V = \frac{{{a^3}\sqrt 2 }}{8}.\)
A. \(4\pi {a^2}.\)
B. \(7\pi {a^2}.\)
C. \(8\pi {a^2}.\)
D. \(6\pi {a^2}.\)
A. \(\pi {a^2}.\)
B. \(\frac{{\pi {a^2}}}{2}.\)
C. \(\frac{{\pi {a^2}\sqrt 3 }}{2}.\)
D. \(\pi {a^2}\sqrt 3 .\)
A. 2
B. 1
C. 3
D. 0
A. \(3\sqrt {39} \left( {c{m^2}} \right).\)
B. \(5\sqrt {21} \left( {c{m^2}} \right).\)
C. \(6\sqrt {13} \left( {c{m^2}} \right).\)
D. \(2\sqrt {23} \left( {c{m^2}} \right).\)
A. \(2a\sqrt 3 .\)
B. \(\frac{{a\sqrt 3 }}{3}.\)
C. \(a\sqrt 3 .\)
D. \(\frac{{a\sqrt 3 }}{6}.\)
A. \(V = \frac{{320}}{\pi }\left( {c{m^3}} \right).\)
B. \(V = \frac{{80}}{\pi }\left( {c{m^3}} \right).\)
C. \(V = \frac{{200}}{\pi }\left( {c{m^3}} \right).\)
D. \(V = \frac{{50}}{\pi }\left( {c{m^3}} \right).\)
A. 1
B. 2
C. 6
D. 0
A. 312
B. 522
C. 405
D. 624
A. \(m = - \frac{3}{8}\)
B. \(m = - \frac{7}{8}\)
C. \(m = \frac{3}{7}\)
D. \(m = \frac{4}{7}\)
A. \(V = \frac{{{a^3}\sqrt 3 }}{6}.\)
B. \(V = \frac{{{a^3}\sqrt 3 }}{3}.\)
C. \(V = \frac{{{4a^3}\sqrt 3 }}{3}.\)
D. \(V = \frac{{3{a^3}\sqrt 3 }}{4}.\)
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